Note 20 — Chapter XXII · CAUSES OF VARIABILITY.
Reading edition
Downing, ‘Fruit-trees of North America,’ p. 422; Foley, in ‘Transact. Hort. Soc.,’ vol. vi. p. 412.
Reading edition
Downing, ‘Fruit-trees of North America,’ p. 422; Foley, in ‘Transact. Hort. Soc.,’ vol. vi. p. 412.